In a Passive Optical Network (PON), which component is located at the service provider's facility?

• A. OLT is located at the service provider facility
• B. ONTs/ONTs are located at the customer premises
• C. Passive splitters are deployed exclusively in data centers
• D. Upstream channel uses wavelength-division multiplexing

Answer: (A)

In a Passive Optical Network, the key control and multiplexing functions sit at the service provider’s facility. The device there, the Optical Line Terminal, is the central point that connects to the provider’s backbone, manages downstream signals sent to many subscribers through the passive splitters, and coordinates the upstream transmissions from multiple Optical Network Terminals at customer sites. The Optical Network Terminal is located at the customer premises, terminating the fiber link to deliver services to end users. Passive splitters are placed in the field as part of the access network, not exclusively in data centers. Upstream generally uses time-division multiplexing on a single wavelength in GPON, with WDM-based upstream being a feature of other variants, not the standard setup. So the component at the service provider facility is the Optical Line Terminal.